: Dial *#06# to see if your IMEI numbers are missing.
: Download a tested backup for your specific model (e.g., Vivo Y83 PD1803BF NVRAM File ). vivo y83 nvram file fix
If none of the above methods work, it's recommended to contact Vivo support or visit a authorized service center for further assistance. : Dial *#06# to see if your IMEI numbers are missing